[css-syntax] Remove lingering references to the <unicode-range-token>.

Author: tabatkins

css-syntax/Overview.bs

@@ -13,7 +13,7 @@ Previous Version: http://www.w3.org/TR/2013/WD-css-syntax-3-20130919/
 Editor: Tab Atkins Jr., Google, http://xanthir.com/contact/
 Editor: Simon Sapin, Mozilla, http://exyr.org/about/
 Abstract: This module describes, in general terms, the basic structure and syntax of CSS stylesheets. It defines, in detail, the syntax and parsing of CSS - how to turn a stream of bytes into a meaningful stylesheet.
-Ignored Terms: <keyframes-name>, <keyframe-rule>, <keyframe-selector>, <translation-value>, <media-query-list>
+Ignored Terms: <keyframes-name>, <keyframe-rule>, <keyframe-selector>, <translation-value>, <media-query-list>, <unicode-range-token>
 Link Defaults: css-text-decor-3 (property) text-decoration, css-color-3 (property) color, css-transforms-1 (function) translatex()
 </pre>
 
@@ -431,7 +431,6 @@ Tokenization</h2>
 	<dfn>&lt;number-token></dfn>,
 	<dfn>&lt;percentage-token></dfn>,
 	<dfn>&lt;dimension-token></dfn>,
-	<dfn>&lt;unicode-range-token></dfn>,
 	<dfn>&lt;include-match-token></dfn>,
 	<dfn>&lt;dash-match-token></dfn>,
 	<dfn>&lt;prefix-match-token></dfn>,
@@ -463,13 +462,6 @@ Tokenization</h2>
 			<<number-token>>, <<percentage-token>>, and <<dimension-token>> have a representation composed of one or more <a>code points</a>, and a numeric value.
 			<<number-token>> and <<dimension-token>> additionally have a type flag set to either "integer" or "number".  The type flag defaults to "integer" if not otherwise set.
 			<<dimension-token>> additionally have a unit composed of one or more <a>code points</a>.
-
-		<li>
-			<<unicode-range-token>> has
-			a <dfn id=unicode-range-start title="start of the range">start</dfn>
-			and an <dfn id=unicode-range-end title="end of the range">end</dfn>,
-			a pair of integers.
-
 	</ul>
 
 	Note: The type flag of hash tokens is used in the Selectors syntax [[SELECT]].
@@ -700,34 +692,6 @@ Token Railroad Diagrams</h3>
 			T: %
 			</pre>
 
-		<dt id="unicode-range-token-diagram"><<unicode-range-token>>
-		<dd>
-			<pre class='railroad'>
-			Choice:
-				T: U
-				T: u
-			T: +
-			Choice:
-				Plus:
-					N: hex digit
-					C: 1-6 times
-				Seq:
-					Star:
-						N: hex digit
-						C: 1-5 times
-					Plus:
-						T: ?
-						C: 1 to (6 - digits) times
-				Seq:
-					Plus:
-						N: hex digit
-						C: 1-6 times
-					T: -
-					Plus:
-						N: hex digit
-						C: 1-6 times
-			</pre>
-
 		<dt id="include-match-token-diagram"><<include-match-token>>
 		<dd>
 			<pre class='railroad'>
@@ -3338,43 +3302,39 @@ Serialization</h2>
 				<th>number
 				<th>percentage
 				<th>dimension
-				<th>unicode range
 				<th>CDC
 				<th>(
 				<th>?
 			<tr>
 				<th>ident
-				<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗ <td>
+				<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗ <td>
 			<tr>
 				<th>at-keyword
-				<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td> <td>
+				<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td> <td>
 			<tr>
 				<th>hash
-				<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td> <td>
+				<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td> <td>
 			<tr>
 				<th>dimension
-				<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td> <td>
+				<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td> <td>
 			<tr>
 				<th>#
-				<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td> <td> <td>
+				<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td>✗<td> <td> <td>
 			<tr>
 				<th>-
-				<td>✗<td>✗<td>✗<td>✗<td> <td>✗<td>✗<td>✗<td>✗<td> <td> <td>
+				<td>✗<td>✗<td>✗<td>✗<td> <td>✗<td>✗<td>✗<td> <td> <td>
 			<tr>
 				<th>number
-				<td>✗<td>✗<td>✗<td>✗<td> <td>✗<td>✗<td>✗<td>✗<td> <td> <td>
+				<td>✗<td>✗<td>✗<td>✗<td> <td>✗<td>✗<td>✗<td> <td> <td>
 			<tr>
 				<th>@
-				<td>✗<td>✗<td>✗<td>✗<td>✗<td> <td> <td> <td>✗<td> <td> <td>
-			<tr>
-				<th>unicode range
-				<td>✗<td>✗<td> <td> <td> <td>✗<td>✗<td>✗<td> <td> <td> <td>✗
+				<td>✗<td>✗<td>✗<td>✗<td>✗<td> <td> <td> <td> <td> <td>
 			<tr>
 				<th>.
-				<td> <td> <td> <td> <td> <td>✗<td>✗<td>✗<td> <td> <td> <td>
+				<td> <td> <td> <td> <td> <td>✗<td>✗<td>✗<td> <td> <td>
 			<tr>
 				<th>+
-				<td> <td> <td> <td> <td> <td>✗<td>✗<td>✗<td> <td> <td> <td>
+				<td> <td> <td> <td> <td> <td>✗<td>✗<td>✗<td> <td> <td>
 		</table>
 
 		<table class='data'>
@@ -3560,8 +3520,15 @@ Changes from CSS 2.1 and Selectors Level 3</h3>
 			e.g. two consecutive <<ident-token>>s.
 
 		<li>
-			The <<unicode-range-token>> is now more restrictive,
-			and doesn't include non-sensical patterns that the 2.1 definition allowed.
+			The <<unicode-range-token>> was removed,
+			as it was low value and occasionally actively harmful.
+			(''u+a { font-weight: bold; }'' was an invalid selector, for example...)
+
+			Instead, a <<urange>> production was added,
+			based on token patterns.
+			It is technically looser than what 2.1 allowed
+			(any number of digits and ? characters),
+			but not in any way that should impact its use in practice.
 
 		<li>
 			Apply the <a href="http://www.w3.org/TR/CSS21/syndata.html#unexpected-eof">EOF error handling rule</a> in the tokenizer